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netns xfrm: add struct xfrm_state::xs_net
[deliverable/linux.git] / include / net / xfrm.h
1 #ifndef _NET_XFRM_H
2 #define _NET_XFRM_H
3
4 #include <linux/compiler.h>
5 #include <linux/xfrm.h>
6 #include <linux/spinlock.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9 #include <linux/socket.h>
10 #include <linux/pfkeyv2.h>
11 #include <linux/ipsec.h>
12 #include <linux/in6.h>
13 #include <linux/mutex.h>
14 #include <linux/audit.h>
15
16 #include <net/sock.h>
17 #include <net/dst.h>
18 #include <net/ip.h>
19 #include <net/route.h>
20 #include <net/ipv6.h>
21 #include <net/ip6_fib.h>
22 #ifdef CONFIG_XFRM_STATISTICS
23 #include <net/snmp.h>
24 #endif
25
26 #define XFRM_PROTO_ESP 50
27 #define XFRM_PROTO_AH 51
28 #define XFRM_PROTO_COMP 108
29 #define XFRM_PROTO_IPIP 4
30 #define XFRM_PROTO_IPV6 41
31 #define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32 #define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
33
34 #define XFRM_ALIGN8(len) (((len) + 7) & ~7)
35 #define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
37 #define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
39
40 #ifdef CONFIG_XFRM_STATISTICS
41 DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42 #define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43 #define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44 #define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
45 #else
46 #define XFRM_INC_STATS(field)
47 #define XFRM_INC_STATS_BH(field)
48 #define XFRM_INC_STATS_USER(field)
49 #endif
50
51 extern struct sock *xfrm_nl;
52 extern u32 sysctl_xfrm_aevent_etime;
53 extern u32 sysctl_xfrm_aevent_rseqth;
54 extern int sysctl_xfrm_larval_drop;
55 extern u32 sysctl_xfrm_acq_expires;
56
57 extern struct mutex xfrm_cfg_mutex;
58
59 /* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120 struct xfrm_state_walk {
121 struct list_head all;
122 u8 state;
123 union {
124 u8 dying;
125 u8 proto;
126 };
127 u32 seq;
128 };
129
130 /* Full description of state of transformer. */
131 struct xfrm_state
132 {
133 #ifdef CONFIG_NET_NS
134 struct net *xs_net;
135 #endif
136 union {
137 struct hlist_node gclist;
138 struct hlist_node bydst;
139 };
140 struct hlist_node bysrc;
141 struct hlist_node byspi;
142
143 atomic_t refcnt;
144 spinlock_t lock;
145
146 struct xfrm_id id;
147 struct xfrm_selector sel;
148
149 u32 genid;
150
151 /* Key manager bits */
152 struct xfrm_state_walk km;
153
154 /* Parameters of this state. */
155 struct {
156 u32 reqid;
157 u8 mode;
158 u8 replay_window;
159 u8 aalgo, ealgo, calgo;
160 u8 flags;
161 u16 family;
162 xfrm_address_t saddr;
163 int header_len;
164 int trailer_len;
165 } props;
166
167 struct xfrm_lifetime_cfg lft;
168
169 /* Data for transformer */
170 struct xfrm_algo *aalg;
171 struct xfrm_algo *ealg;
172 struct xfrm_algo *calg;
173 struct xfrm_algo_aead *aead;
174
175 /* Data for encapsulator */
176 struct xfrm_encap_tmpl *encap;
177
178 /* Data for care-of address */
179 xfrm_address_t *coaddr;
180
181 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
182 struct xfrm_state *tunnel;
183
184 /* If a tunnel, number of users + 1 */
185 atomic_t tunnel_users;
186
187 /* State for replay detection */
188 struct xfrm_replay_state replay;
189
190 /* Replay detection state at the time we sent the last notification */
191 struct xfrm_replay_state preplay;
192
193 /* internal flag that only holds state for delayed aevent at the
194 * moment
195 */
196 u32 xflags;
197
198 /* Replay detection notification settings */
199 u32 replay_maxage;
200 u32 replay_maxdiff;
201
202 /* Replay detection notification timer */
203 struct timer_list rtimer;
204
205 /* Statistics */
206 struct xfrm_stats stats;
207
208 struct xfrm_lifetime_cur curlft;
209 struct timer_list timer;
210
211 /* Last used time */
212 unsigned long lastused;
213
214 /* Reference to data common to all the instances of this
215 * transformer. */
216 const struct xfrm_type *type;
217 struct xfrm_mode *inner_mode;
218 struct xfrm_mode *inner_mode_iaf;
219 struct xfrm_mode *outer_mode;
220
221 /* Security context */
222 struct xfrm_sec_ctx *security;
223
224 /* Private data of this transformer, format is opaque,
225 * interpreted by xfrm_type methods. */
226 void *data;
227 };
228
229 static inline struct net *xs_net(struct xfrm_state *x)
230 {
231 return read_pnet(&x->xs_net);
232 }
233
234 /* xflags - make enum if more show up */
235 #define XFRM_TIME_DEFER 1
236
237 enum {
238 XFRM_STATE_VOID,
239 XFRM_STATE_ACQ,
240 XFRM_STATE_VALID,
241 XFRM_STATE_ERROR,
242 XFRM_STATE_EXPIRED,
243 XFRM_STATE_DEAD
244 };
245
246 /* callback structure passed from either netlink or pfkey */
247 struct km_event
248 {
249 union {
250 u32 hard;
251 u32 proto;
252 u32 byid;
253 u32 aevent;
254 u32 type;
255 } data;
256
257 u32 seq;
258 u32 pid;
259 u32 event;
260 };
261
262 struct net_device;
263 struct xfrm_type;
264 struct xfrm_dst;
265 struct xfrm_policy_afinfo {
266 unsigned short family;
267 struct dst_ops *dst_ops;
268 void (*garbage_collect)(void);
269 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
270 xfrm_address_t *daddr);
271 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
272 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
273 void (*decode_session)(struct sk_buff *skb,
274 struct flowi *fl,
275 int reverse);
276 int (*get_tos)(struct flowi *fl);
277 int (*init_path)(struct xfrm_dst *path,
278 struct dst_entry *dst,
279 int nfheader_len);
280 int (*fill_dst)(struct xfrm_dst *xdst,
281 struct net_device *dev);
282 };
283
284 extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
285 extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
286 extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
287 extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
288
289 struct xfrm_tmpl;
290 extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
291 extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
292 extern int __xfrm_state_delete(struct xfrm_state *x);
293
294 struct xfrm_state_afinfo {
295 unsigned int family;
296 unsigned int proto;
297 __be16 eth_proto;
298 struct module *owner;
299 const struct xfrm_type *type_map[IPPROTO_MAX];
300 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
301 int (*init_flags)(struct xfrm_state *x);
302 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
303 struct xfrm_tmpl *tmpl,
304 xfrm_address_t *daddr, xfrm_address_t *saddr);
305 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
306 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
307 int (*output)(struct sk_buff *skb);
308 int (*extract_input)(struct xfrm_state *x,
309 struct sk_buff *skb);
310 int (*extract_output)(struct xfrm_state *x,
311 struct sk_buff *skb);
312 int (*transport_finish)(struct sk_buff *skb,
313 int async);
314 };
315
316 extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
317 extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
318
319 extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
320
321 struct xfrm_type
322 {
323 char *description;
324 struct module *owner;
325 __u8 proto;
326 __u8 flags;
327 #define XFRM_TYPE_NON_FRAGMENT 1
328 #define XFRM_TYPE_REPLAY_PROT 2
329 #define XFRM_TYPE_LOCAL_COADDR 4
330 #define XFRM_TYPE_REMOTE_COADDR 8
331
332 int (*init_state)(struct xfrm_state *x);
333 void (*destructor)(struct xfrm_state *);
334 int (*input)(struct xfrm_state *, struct sk_buff *skb);
335 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
336 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
337 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
338 /* Estimate maximal size of result of transformation of a dgram */
339 u32 (*get_mtu)(struct xfrm_state *, int size);
340 };
341
342 extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
343 extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
344
345 struct xfrm_mode {
346 /*
347 * Remove encapsulation header.
348 *
349 * The IP header will be moved over the top of the encapsulation
350 * header.
351 *
352 * On entry, the transport header shall point to where the IP header
353 * should be and the network header shall be set to where the IP
354 * header currently is. skb->data shall point to the start of the
355 * payload.
356 */
357 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
358
359 /*
360 * This is the actual input entry point.
361 *
362 * For transport mode and equivalent this would be identical to
363 * input2 (which does not need to be set). While tunnel mode
364 * and equivalent would set this to the tunnel encapsulation function
365 * xfrm4_prepare_input that would in turn call input2.
366 */
367 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
368
369 /*
370 * Add encapsulation header.
371 *
372 * On exit, the transport header will be set to the start of the
373 * encapsulation header to be filled in by x->type->output and
374 * the mac header will be set to the nextheader (protocol for
375 * IPv4) field of the extension header directly preceding the
376 * encapsulation header, or in its absence, that of the top IP
377 * header. The value of the network header will always point
378 * to the top IP header while skb->data will point to the payload.
379 */
380 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
381
382 /*
383 * This is the actual output entry point.
384 *
385 * For transport mode and equivalent this would be identical to
386 * output2 (which does not need to be set). While tunnel mode
387 * and equivalent would set this to a tunnel encapsulation function
388 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
389 * call output2.
390 */
391 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
392
393 struct xfrm_state_afinfo *afinfo;
394 struct module *owner;
395 unsigned int encap;
396 int flags;
397 };
398
399 /* Flags for xfrm_mode. */
400 enum {
401 XFRM_MODE_FLAG_TUNNEL = 1,
402 };
403
404 extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
405 extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
406
407 static inline int xfrm_af2proto(unsigned int family)
408 {
409 switch(family) {
410 case AF_INET:
411 return IPPROTO_IPIP;
412 case AF_INET6:
413 return IPPROTO_IPV6;
414 default:
415 return 0;
416 }
417 }
418
419 static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
420 {
421 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
422 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
423 return x->inner_mode;
424 else
425 return x->inner_mode_iaf;
426 }
427
428 struct xfrm_tmpl
429 {
430 /* id in template is interpreted as:
431 * daddr - destination of tunnel, may be zero for transport mode.
432 * spi - zero to acquire spi. Not zero if spi is static, then
433 * daddr must be fixed too.
434 * proto - AH/ESP/IPCOMP
435 */
436 struct xfrm_id id;
437
438 /* Source address of tunnel. Ignored, if it is not a tunnel. */
439 xfrm_address_t saddr;
440
441 unsigned short encap_family;
442
443 __u32 reqid;
444
445 /* Mode: transport, tunnel etc. */
446 __u8 mode;
447
448 /* Sharing mode: unique, this session only, this user only etc. */
449 __u8 share;
450
451 /* May skip this transfomration if no SA is found */
452 __u8 optional;
453
454 /* Skip aalgos/ealgos/calgos checks. */
455 __u8 allalgs;
456
457 /* Bit mask of algos allowed for acquisition */
458 __u32 aalgos;
459 __u32 ealgos;
460 __u32 calgos;
461 };
462
463 #define XFRM_MAX_DEPTH 6
464
465 struct xfrm_policy_walk_entry {
466 struct list_head all;
467 u8 dead;
468 };
469
470 struct xfrm_policy_walk {
471 struct xfrm_policy_walk_entry walk;
472 u8 type;
473 u32 seq;
474 };
475
476 struct xfrm_policy
477 {
478 struct hlist_node bydst;
479 struct hlist_node byidx;
480
481 /* This lock only affects elements except for entry. */
482 rwlock_t lock;
483 atomic_t refcnt;
484 struct timer_list timer;
485
486 u32 priority;
487 u32 index;
488 struct xfrm_selector selector;
489 struct xfrm_lifetime_cfg lft;
490 struct xfrm_lifetime_cur curlft;
491 struct dst_entry *bundles;
492 struct xfrm_policy_walk_entry walk;
493 u8 type;
494 u8 action;
495 u8 flags;
496 u8 xfrm_nr;
497 u16 family;
498 struct xfrm_sec_ctx *security;
499 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
500 };
501
502 struct xfrm_kmaddress {
503 xfrm_address_t local;
504 xfrm_address_t remote;
505 u32 reserved;
506 u16 family;
507 };
508
509 struct xfrm_migrate {
510 xfrm_address_t old_daddr;
511 xfrm_address_t old_saddr;
512 xfrm_address_t new_daddr;
513 xfrm_address_t new_saddr;
514 u8 proto;
515 u8 mode;
516 u16 reserved;
517 u32 reqid;
518 u16 old_family;
519 u16 new_family;
520 };
521
522 #define XFRM_KM_TIMEOUT 30
523 /* which seqno */
524 #define XFRM_REPLAY_SEQ 1
525 #define XFRM_REPLAY_OSEQ 2
526 #define XFRM_REPLAY_SEQ_MASK 3
527 /* what happened */
528 #define XFRM_REPLAY_UPDATE XFRM_AE_CR
529 #define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
530
531 /* default aevent timeout in units of 100ms */
532 #define XFRM_AE_ETIME 10
533 /* Async Event timer multiplier */
534 #define XFRM_AE_ETH_M 10
535 /* default seq threshold size */
536 #define XFRM_AE_SEQT_SIZE 2
537
538 struct xfrm_mgr
539 {
540 struct list_head list;
541 char *id;
542 int (*notify)(struct xfrm_state *x, struct km_event *c);
543 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
544 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
545 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
546 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
547 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
548 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
549 };
550
551 extern int xfrm_register_km(struct xfrm_mgr *km);
552 extern int xfrm_unregister_km(struct xfrm_mgr *km);
553
554 extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
555
556 /*
557 * This structure is used for the duration where packets are being
558 * transformed by IPsec. As soon as the packet leaves IPsec the
559 * area beyond the generic IP part may be overwritten.
560 */
561 struct xfrm_skb_cb {
562 union {
563 struct inet_skb_parm h4;
564 struct inet6_skb_parm h6;
565 } header;
566
567 /* Sequence number for replay protection. */
568 union {
569 u64 output;
570 __be32 input;
571 } seq;
572 };
573
574 #define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
575
576 /*
577 * This structure is used by the afinfo prepare_input/prepare_output functions
578 * to transmit header information to the mode input/output functions.
579 */
580 struct xfrm_mode_skb_cb {
581 union {
582 struct inet_skb_parm h4;
583 struct inet6_skb_parm h6;
584 } header;
585
586 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
587 __be16 id;
588 __be16 frag_off;
589
590 /* IP header length (excluding options or extension headers). */
591 u8 ihl;
592
593 /* TOS for IPv4, class for IPv6. */
594 u8 tos;
595
596 /* TTL for IPv4, hop limitfor IPv6. */
597 u8 ttl;
598
599 /* Protocol for IPv4, NH for IPv6. */
600 u8 protocol;
601
602 /* Option length for IPv4, zero for IPv6. */
603 u8 optlen;
604
605 /* Used by IPv6 only, zero for IPv4. */
606 u8 flow_lbl[3];
607 };
608
609 #define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
610
611 /*
612 * This structure is used by the input processing to locate the SPI and
613 * related information.
614 */
615 struct xfrm_spi_skb_cb {
616 union {
617 struct inet_skb_parm h4;
618 struct inet6_skb_parm h6;
619 } header;
620
621 unsigned int daddroff;
622 unsigned int family;
623 };
624
625 #define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
626
627 /* Audit Information */
628 struct xfrm_audit
629 {
630 u32 secid;
631 uid_t loginuid;
632 u32 sessionid;
633 };
634
635 #ifdef CONFIG_AUDITSYSCALL
636 static inline struct audit_buffer *xfrm_audit_start(const char *op)
637 {
638 struct audit_buffer *audit_buf = NULL;
639
640 if (audit_enabled == 0)
641 return NULL;
642 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
643 AUDIT_MAC_IPSEC_EVENT);
644 if (audit_buf == NULL)
645 return NULL;
646 audit_log_format(audit_buf, "op=%s", op);
647 return audit_buf;
648 }
649
650 static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
651 struct audit_buffer *audit_buf)
652 {
653 char *secctx;
654 u32 secctx_len;
655
656 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
657 if (secid != 0 &&
658 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
659 audit_log_format(audit_buf, " subj=%s", secctx);
660 security_release_secctx(secctx, secctx_len);
661 } else
662 audit_log_task_context(audit_buf);
663 }
664
665 extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
666 u32 auid, u32 ses, u32 secid);
667 extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
668 u32 auid, u32 ses, u32 secid);
669 extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
670 u32 auid, u32 ses, u32 secid);
671 extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
672 u32 auid, u32 ses, u32 secid);
673 extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
674 struct sk_buff *skb);
675 extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
676 extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
677 __be32 net_spi, __be32 net_seq);
678 extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
679 struct sk_buff *skb, u8 proto);
680 #else
681
682 static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
683 u32 auid, u32 ses, u32 secid)
684 {
685 }
686
687 static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
688 u32 auid, u32 ses, u32 secid)
689 {
690 }
691
692 static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
693 u32 auid, u32 ses, u32 secid)
694 {
695 }
696
697 static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
698 u32 auid, u32 ses, u32 secid)
699 {
700 }
701
702 static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
703 struct sk_buff *skb)
704 {
705 }
706
707 static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
708 u16 family)
709 {
710 }
711
712 static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
713 __be32 net_spi, __be32 net_seq)
714 {
715 }
716
717 static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
718 struct sk_buff *skb, u8 proto)
719 {
720 }
721 #endif /* CONFIG_AUDITSYSCALL */
722
723 static inline void xfrm_pol_hold(struct xfrm_policy *policy)
724 {
725 if (likely(policy != NULL))
726 atomic_inc(&policy->refcnt);
727 }
728
729 extern void xfrm_policy_destroy(struct xfrm_policy *policy);
730
731 static inline void xfrm_pol_put(struct xfrm_policy *policy)
732 {
733 if (atomic_dec_and_test(&policy->refcnt))
734 xfrm_policy_destroy(policy);
735 }
736
737 #ifdef CONFIG_XFRM_SUB_POLICY
738 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
739 {
740 int i;
741 for (i = npols - 1; i >= 0; --i)
742 xfrm_pol_put(pols[i]);
743 }
744 #else
745 static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
746 {
747 xfrm_pol_put(pols[0]);
748 }
749 #endif
750
751 extern void __xfrm_state_destroy(struct xfrm_state *);
752
753 static inline void __xfrm_state_put(struct xfrm_state *x)
754 {
755 atomic_dec(&x->refcnt);
756 }
757
758 static inline void xfrm_state_put(struct xfrm_state *x)
759 {
760 if (atomic_dec_and_test(&x->refcnt))
761 __xfrm_state_destroy(x);
762 }
763
764 static inline void xfrm_state_hold(struct xfrm_state *x)
765 {
766 atomic_inc(&x->refcnt);
767 }
768
769 static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
770 {
771 __be32 *a1 = token1;
772 __be32 *a2 = token2;
773 int pdw;
774 int pbi;
775
776 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
777 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
778
779 if (pdw)
780 if (memcmp(a1, a2, pdw << 2))
781 return 0;
782
783 if (pbi) {
784 __be32 mask;
785
786 mask = htonl((0xffffffff) << (32 - pbi));
787
788 if ((a1[pdw] ^ a2[pdw]) & mask)
789 return 0;
790 }
791
792 return 1;
793 }
794
795 static __inline__
796 __be16 xfrm_flowi_sport(struct flowi *fl)
797 {
798 __be16 port;
799 switch(fl->proto) {
800 case IPPROTO_TCP:
801 case IPPROTO_UDP:
802 case IPPROTO_UDPLITE:
803 case IPPROTO_SCTP:
804 port = fl->fl_ip_sport;
805 break;
806 case IPPROTO_ICMP:
807 case IPPROTO_ICMPV6:
808 port = htons(fl->fl_icmp_type);
809 break;
810 case IPPROTO_MH:
811 port = htons(fl->fl_mh_type);
812 break;
813 default:
814 port = 0; /*XXX*/
815 }
816 return port;
817 }
818
819 static __inline__
820 __be16 xfrm_flowi_dport(struct flowi *fl)
821 {
822 __be16 port;
823 switch(fl->proto) {
824 case IPPROTO_TCP:
825 case IPPROTO_UDP:
826 case IPPROTO_UDPLITE:
827 case IPPROTO_SCTP:
828 port = fl->fl_ip_dport;
829 break;
830 case IPPROTO_ICMP:
831 case IPPROTO_ICMPV6:
832 port = htons(fl->fl_icmp_code);
833 break;
834 default:
835 port = 0; /*XXX*/
836 }
837 return port;
838 }
839
840 extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
841 unsigned short family);
842
843 #ifdef CONFIG_SECURITY_NETWORK_XFRM
844 /* If neither has a context --> match
845 * Otherwise, both must have a context and the sids, doi, alg must match
846 */
847 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
848 {
849 return ((!s1 && !s2) ||
850 (s1 && s2 &&
851 (s1->ctx_sid == s2->ctx_sid) &&
852 (s1->ctx_doi == s2->ctx_doi) &&
853 (s1->ctx_alg == s2->ctx_alg)));
854 }
855 #else
856 static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
857 {
858 return 1;
859 }
860 #endif
861
862 /* A struct encoding bundle of transformations to apply to some set of flow.
863 *
864 * dst->child points to the next element of bundle.
865 * dst->xfrm points to an instanse of transformer.
866 *
867 * Due to unfortunate limitations of current routing cache, which we
868 * have no time to fix, it mirrors struct rtable and bound to the same
869 * routing key, including saddr,daddr. However, we can have many of
870 * bundles differing by session id. All the bundles grow from a parent
871 * policy rule.
872 */
873 struct xfrm_dst
874 {
875 union {
876 struct dst_entry dst;
877 struct rtable rt;
878 struct rt6_info rt6;
879 } u;
880 struct dst_entry *route;
881 #ifdef CONFIG_XFRM_SUB_POLICY
882 struct flowi *origin;
883 struct xfrm_selector *partner;
884 #endif
885 u32 genid;
886 u32 route_mtu_cached;
887 u32 child_mtu_cached;
888 u32 route_cookie;
889 u32 path_cookie;
890 };
891
892 #ifdef CONFIG_XFRM
893 static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
894 {
895 dst_release(xdst->route);
896 if (likely(xdst->u.dst.xfrm))
897 xfrm_state_put(xdst->u.dst.xfrm);
898 #ifdef CONFIG_XFRM_SUB_POLICY
899 kfree(xdst->origin);
900 xdst->origin = NULL;
901 kfree(xdst->partner);
902 xdst->partner = NULL;
903 #endif
904 }
905 #endif
906
907 extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
908
909 struct sec_path
910 {
911 atomic_t refcnt;
912 int len;
913 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
914 };
915
916 static inline struct sec_path *
917 secpath_get(struct sec_path *sp)
918 {
919 if (sp)
920 atomic_inc(&sp->refcnt);
921 return sp;
922 }
923
924 extern void __secpath_destroy(struct sec_path *sp);
925
926 static inline void
927 secpath_put(struct sec_path *sp)
928 {
929 if (sp && atomic_dec_and_test(&sp->refcnt))
930 __secpath_destroy(sp);
931 }
932
933 extern struct sec_path *secpath_dup(struct sec_path *src);
934
935 static inline void
936 secpath_reset(struct sk_buff *skb)
937 {
938 #ifdef CONFIG_XFRM
939 secpath_put(skb->sp);
940 skb->sp = NULL;
941 #endif
942 }
943
944 static inline int
945 xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
946 {
947 switch (family) {
948 case AF_INET:
949 return addr->a4 == 0;
950 case AF_INET6:
951 return ipv6_addr_any((struct in6_addr *)&addr->a6);
952 }
953 return 0;
954 }
955
956 static inline int
957 __xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
958 {
959 return (tmpl->saddr.a4 &&
960 tmpl->saddr.a4 != x->props.saddr.a4);
961 }
962
963 static inline int
964 __xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
965 {
966 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
967 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
968 }
969
970 static inline int
971 xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
972 {
973 switch (family) {
974 case AF_INET:
975 return __xfrm4_state_addr_cmp(tmpl, x);
976 case AF_INET6:
977 return __xfrm6_state_addr_cmp(tmpl, x);
978 }
979 return !0;
980 }
981
982 #ifdef CONFIG_XFRM
983 extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
984
985 static inline int __xfrm_policy_check2(struct sock *sk, int dir,
986 struct sk_buff *skb,
987 unsigned int family, int reverse)
988 {
989 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
990
991 if (sk && sk->sk_policy[XFRM_POLICY_IN])
992 return __xfrm_policy_check(sk, ndir, skb, family);
993
994 return (!xfrm_policy_count[dir] && !skb->sp) ||
995 (skb->dst->flags & DST_NOPOLICY) ||
996 __xfrm_policy_check(sk, ndir, skb, family);
997 }
998
999 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1000 {
1001 return __xfrm_policy_check2(sk, dir, skb, family, 0);
1002 }
1003
1004 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1005 {
1006 return xfrm_policy_check(sk, dir, skb, AF_INET);
1007 }
1008
1009 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1010 {
1011 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1012 }
1013
1014 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1015 struct sk_buff *skb)
1016 {
1017 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1018 }
1019
1020 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1021 struct sk_buff *skb)
1022 {
1023 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1024 }
1025
1026 extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1027 unsigned int family, int reverse);
1028
1029 static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1030 unsigned int family)
1031 {
1032 return __xfrm_decode_session(skb, fl, family, 0);
1033 }
1034
1035 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1036 struct flowi *fl,
1037 unsigned int family)
1038 {
1039 return __xfrm_decode_session(skb, fl, family, 1);
1040 }
1041
1042 extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1043
1044 static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1045 {
1046 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
1047 (skb->dst->flags & DST_NOXFRM) ||
1048 __xfrm_route_forward(skb, family);
1049 }
1050
1051 static inline int xfrm4_route_forward(struct sk_buff *skb)
1052 {
1053 return xfrm_route_forward(skb, AF_INET);
1054 }
1055
1056 static inline int xfrm6_route_forward(struct sk_buff *skb)
1057 {
1058 return xfrm_route_forward(skb, AF_INET6);
1059 }
1060
1061 extern int __xfrm_sk_clone_policy(struct sock *sk);
1062
1063 static inline int xfrm_sk_clone_policy(struct sock *sk)
1064 {
1065 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1066 return __xfrm_sk_clone_policy(sk);
1067 return 0;
1068 }
1069
1070 extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
1071
1072 static inline void xfrm_sk_free_policy(struct sock *sk)
1073 {
1074 if (unlikely(sk->sk_policy[0] != NULL)) {
1075 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1076 sk->sk_policy[0] = NULL;
1077 }
1078 if (unlikely(sk->sk_policy[1] != NULL)) {
1079 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1080 sk->sk_policy[1] = NULL;
1081 }
1082 }
1083
1084 #else
1085
1086 static inline void xfrm_sk_free_policy(struct sock *sk) {}
1087 static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1088 static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1089 static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1090 static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1091 {
1092 return 1;
1093 }
1094 static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1095 {
1096 return 1;
1097 }
1098 static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1099 {
1100 return 1;
1101 }
1102 static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1103 struct flowi *fl,
1104 unsigned int family)
1105 {
1106 return -ENOSYS;
1107 }
1108 static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1109 struct sk_buff *skb)
1110 {
1111 return 1;
1112 }
1113 static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1114 struct sk_buff *skb)
1115 {
1116 return 1;
1117 }
1118 #endif
1119
1120 static __inline__
1121 xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1122 {
1123 switch (family){
1124 case AF_INET:
1125 return (xfrm_address_t *)&fl->fl4_dst;
1126 case AF_INET6:
1127 return (xfrm_address_t *)&fl->fl6_dst;
1128 }
1129 return NULL;
1130 }
1131
1132 static __inline__
1133 xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1134 {
1135 switch (family){
1136 case AF_INET:
1137 return (xfrm_address_t *)&fl->fl4_src;
1138 case AF_INET6:
1139 return (xfrm_address_t *)&fl->fl6_src;
1140 }
1141 return NULL;
1142 }
1143
1144 static __inline__
1145 void xfrm_flowi_addr_get(struct flowi *fl,
1146 xfrm_address_t *saddr, xfrm_address_t *daddr,
1147 unsigned short family)
1148 {
1149 switch(family) {
1150 case AF_INET:
1151 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1152 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1153 break;
1154 case AF_INET6:
1155 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1156 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1157 break;
1158 }
1159 }
1160
1161 static __inline__ int
1162 __xfrm4_state_addr_check(struct xfrm_state *x,
1163 xfrm_address_t *daddr, xfrm_address_t *saddr)
1164 {
1165 if (daddr->a4 == x->id.daddr.a4 &&
1166 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1167 return 1;
1168 return 0;
1169 }
1170
1171 static __inline__ int
1172 __xfrm6_state_addr_check(struct xfrm_state *x,
1173 xfrm_address_t *daddr, xfrm_address_t *saddr)
1174 {
1175 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1176 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1177 ipv6_addr_any((struct in6_addr *)saddr) ||
1178 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1179 return 1;
1180 return 0;
1181 }
1182
1183 static __inline__ int
1184 xfrm_state_addr_check(struct xfrm_state *x,
1185 xfrm_address_t *daddr, xfrm_address_t *saddr,
1186 unsigned short family)
1187 {
1188 switch (family) {
1189 case AF_INET:
1190 return __xfrm4_state_addr_check(x, daddr, saddr);
1191 case AF_INET6:
1192 return __xfrm6_state_addr_check(x, daddr, saddr);
1193 }
1194 return 0;
1195 }
1196
1197 static __inline__ int
1198 xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1199 unsigned short family)
1200 {
1201 switch (family) {
1202 case AF_INET:
1203 return __xfrm4_state_addr_check(x,
1204 (xfrm_address_t *)&fl->fl4_dst,
1205 (xfrm_address_t *)&fl->fl4_src);
1206 case AF_INET6:
1207 return __xfrm6_state_addr_check(x,
1208 (xfrm_address_t *)&fl->fl6_dst,
1209 (xfrm_address_t *)&fl->fl6_src);
1210 }
1211 return 0;
1212 }
1213
1214 static inline int xfrm_state_kern(struct xfrm_state *x)
1215 {
1216 return atomic_read(&x->tunnel_users);
1217 }
1218
1219 static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1220 {
1221 return (!userproto || proto == userproto ||
1222 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1223 proto == IPPROTO_ESP ||
1224 proto == IPPROTO_COMP)));
1225 }
1226
1227 /*
1228 * xfrm algorithm information
1229 */
1230 struct xfrm_algo_aead_info {
1231 u16 icv_truncbits;
1232 };
1233
1234 struct xfrm_algo_auth_info {
1235 u16 icv_truncbits;
1236 u16 icv_fullbits;
1237 };
1238
1239 struct xfrm_algo_encr_info {
1240 u16 blockbits;
1241 u16 defkeybits;
1242 };
1243
1244 struct xfrm_algo_comp_info {
1245 u16 threshold;
1246 };
1247
1248 struct xfrm_algo_desc {
1249 char *name;
1250 char *compat;
1251 u8 available:1;
1252 union {
1253 struct xfrm_algo_aead_info aead;
1254 struct xfrm_algo_auth_info auth;
1255 struct xfrm_algo_encr_info encr;
1256 struct xfrm_algo_comp_info comp;
1257 } uinfo;
1258 struct sadb_alg desc;
1259 };
1260
1261 /* XFRM tunnel handlers. */
1262 struct xfrm_tunnel {
1263 int (*handler)(struct sk_buff *skb);
1264 int (*err_handler)(struct sk_buff *skb, __u32 info);
1265
1266 struct xfrm_tunnel *next;
1267 int priority;
1268 };
1269
1270 struct xfrm6_tunnel {
1271 int (*handler)(struct sk_buff *skb);
1272 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
1273 int type, int code, int offset, __be32 info);
1274 struct xfrm6_tunnel *next;
1275 int priority;
1276 };
1277
1278 extern void xfrm_init(void);
1279 extern void xfrm4_init(void);
1280 extern int xfrm_state_init(struct net *net);
1281 extern void xfrm_state_fini(struct net *net);
1282 extern void xfrm4_state_init(void);
1283 #ifdef CONFIG_XFRM
1284 extern int xfrm6_init(void);
1285 extern void xfrm6_fini(void);
1286 extern int xfrm6_state_init(void);
1287 extern void xfrm6_state_fini(void);
1288 #else
1289 static inline int xfrm6_init(void)
1290 {
1291 return 0;
1292 }
1293 static inline void xfrm6_fini(void)
1294 {
1295 ;
1296 }
1297 #endif
1298
1299 #ifdef CONFIG_XFRM_STATISTICS
1300 extern int xfrm_proc_init(void);
1301 #endif
1302
1303 extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
1304 extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1305 int (*func)(struct xfrm_state *, int, void*), void *);
1306 extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
1307 extern struct xfrm_state *xfrm_state_alloc(struct net *net);
1308 extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1309 struct flowi *fl, struct xfrm_tmpl *tmpl,
1310 struct xfrm_policy *pol, int *err,
1311 unsigned short family);
1312 extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1313 xfrm_address_t *saddr,
1314 unsigned short family,
1315 u8 mode, u8 proto, u32 reqid);
1316 extern int xfrm_state_check_expire(struct xfrm_state *x);
1317 extern void xfrm_state_insert(struct xfrm_state *x);
1318 extern int xfrm_state_add(struct xfrm_state *x);
1319 extern int xfrm_state_update(struct xfrm_state *x);
1320 extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1321 extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
1322 #ifdef CONFIG_XFRM_SUB_POLICY
1323 extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1324 int n, unsigned short family);
1325 extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1326 int n, unsigned short family);
1327 #else
1328 static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1329 int n, unsigned short family)
1330 {
1331 return -ENOSYS;
1332 }
1333
1334 static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1335 int n, unsigned short family)
1336 {
1337 return -ENOSYS;
1338 }
1339 #endif
1340
1341 struct xfrmk_sadinfo {
1342 u32 sadhcnt; /* current hash bkts */
1343 u32 sadhmcnt; /* max allowed hash bkts */
1344 u32 sadcnt; /* current running count */
1345 };
1346
1347 struct xfrmk_spdinfo {
1348 u32 incnt;
1349 u32 outcnt;
1350 u32 fwdcnt;
1351 u32 inscnt;
1352 u32 outscnt;
1353 u32 fwdscnt;
1354 u32 spdhcnt;
1355 u32 spdhmcnt;
1356 };
1357
1358 extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
1359 extern int xfrm_state_delete(struct xfrm_state *x);
1360 extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
1361 extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
1362 extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
1363 extern int xfrm_replay_check(struct xfrm_state *x,
1364 struct sk_buff *skb, __be32 seq);
1365 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
1366 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
1367 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
1368 extern int xfrm_init_state(struct xfrm_state *x);
1369 extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
1370 extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1371 int encap_type);
1372 extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
1373 extern int xfrm_output_resume(struct sk_buff *skb, int err);
1374 extern int xfrm_output(struct sk_buff *skb);
1375 extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1376 extern int xfrm4_extract_header(struct sk_buff *skb);
1377 extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1378 extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1379 int encap_type);
1380 extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
1381 extern int xfrm4_rcv(struct sk_buff *skb);
1382
1383 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1384 {
1385 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1386 }
1387
1388 extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1389 extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1390 extern int xfrm4_output(struct sk_buff *skb);
1391 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1392 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
1393 extern int xfrm6_extract_header(struct sk_buff *skb);
1394 extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
1395 extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
1396 extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
1397 extern int xfrm6_rcv(struct sk_buff *skb);
1398 extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1399 xfrm_address_t *saddr, u8 proto);
1400 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1401 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
1402 extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
1403 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
1404 extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
1405 extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1406 extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
1407 extern int xfrm6_output(struct sk_buff *skb);
1408 extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1409 u8 **prevhdr);
1410
1411 #ifdef CONFIG_XFRM
1412 extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
1413 extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
1414 #else
1415 static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1416 {
1417 return -ENOPROTOOPT;
1418 }
1419
1420 static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
1421 {
1422 /* should not happen */
1423 kfree_skb(skb);
1424 return 0;
1425 }
1426 #endif
1427
1428 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
1429
1430 extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
1431 extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1432 int (*func)(struct xfrm_policy *, int, int, void*), void *);
1433 extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
1434 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
1435 struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1436 struct xfrm_selector *sel,
1437 struct xfrm_sec_ctx *ctx, int delete,
1438 int *err);
1439 struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
1440 int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
1441 u32 xfrm_get_acqseq(void);
1442 extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
1443 struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1444 xfrm_address_t *daddr, xfrm_address_t *saddr,
1445 int create, unsigned short family);
1446 extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
1447 extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1448 struct flowi *fl, int family, int strict);
1449
1450 #ifdef CONFIG_XFRM_MIGRATE
1451 extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1452 struct xfrm_migrate *m, int num_bundles,
1453 struct xfrm_kmaddress *k);
1454 extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1455 extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1456 struct xfrm_migrate *m);
1457 extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1458 struct xfrm_migrate *m, int num_bundles,
1459 struct xfrm_kmaddress *k);
1460 #endif
1461
1462 extern wait_queue_head_t km_waitq;
1463 extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
1464 extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
1465 extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
1466
1467 extern void xfrm_input_init(void);
1468 extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
1469
1470 extern void xfrm_probe_algs(void);
1471 extern int xfrm_count_auth_supported(void);
1472 extern int xfrm_count_enc_supported(void);
1473 extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1474 extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1475 extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1476 extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1477 extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1478 extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1479 extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1480 extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
1481 extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1482 int probe);
1483
1484 struct hash_desc;
1485 struct scatterlist;
1486 typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1487 unsigned int);
1488
1489 extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1490 int offset, int len, icv_update_fn_t icv_update);
1491
1492 static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1493 int family)
1494 {
1495 switch (family) {
1496 default:
1497 case AF_INET:
1498 return (__force __u32)a->a4 - (__force __u32)b->a4;
1499 case AF_INET6:
1500 return ipv6_addr_cmp((struct in6_addr *)a,
1501 (struct in6_addr *)b);
1502 }
1503 }
1504
1505 static inline int xfrm_policy_id2dir(u32 index)
1506 {
1507 return index & 7;
1508 }
1509
1510 static inline int xfrm_aevent_is_on(void)
1511 {
1512 struct sock *nlsk;
1513 int ret = 0;
1514
1515 rcu_read_lock();
1516 nlsk = rcu_dereference(xfrm_nl);
1517 if (nlsk)
1518 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1519 rcu_read_unlock();
1520 return ret;
1521 }
1522
1523 static inline int xfrm_alg_len(struct xfrm_algo *alg)
1524 {
1525 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1526 }
1527
1528 #ifdef CONFIG_XFRM_MIGRATE
1529 static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1530 {
1531 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
1532 }
1533
1534 static inline void xfrm_states_put(struct xfrm_state **states, int n)
1535 {
1536 int i;
1537 for (i = 0; i < n; i++)
1538 xfrm_state_put(*(states + i));
1539 }
1540
1541 static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1542 {
1543 int i;
1544 for (i = 0; i < n; i++)
1545 xfrm_state_delete(*(states + i));
1546 }
1547 #endif
1548
1549 #ifdef CONFIG_XFRM
1550 static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1551 {
1552 return skb->sp->xvec[skb->sp->len - 1];
1553 }
1554 #endif
1555
1556 #endif /* _NET_XFRM_H */
Linux kernel - Deliverables
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